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-----Original Message-----
From: Paul Marbourg [mailto:zborg@earthlink.net]
Sent: Saturday, March 05, 2005 10:20 AM
To: 'amps@contesting.com'
Subject: RE: Liquid Cooling Systems
Hi group. I am sorry, but I can't stand it any longer!
There is virtually NO difference between "D.I." and distilled water if the
purification system(s) is (are) in good working order. Either process
exposes the working fluid (water) to potential environmental contamination
if the process stream is not properly engineered from a materials
standpoint. Typically, an in-line conductivity meter monitors the fluid
conductivity of the process stream. When the conductivity of a DI stream
rises above the set point, the flow is routed through a fresh column or
production is terminated until the column can be replaced. DI systems
consist of passing the water through a bed of cascade-cycled ion-exchange
resin beads, one bed for positive and one bed for negative ions. There may
be an additional activated carbon filter for stripping non-polar trace
organics out of the process stream as well, in high purity systems.
Distillation stills, although very effective at removing ionic impurities,
run the risk of still being contaminated with trace organic impurities
(which have sufficient vapor pressure to be entrained through the still or
transfer via azeotropic interaction with water). Thus either source of
deionized water benefits by running it through an activated carbon filter.
Once high purity water has been produced, it's origin does not mean a damn
thing. Perhaps you were confusing DI water with softened water?
In addition, ethylene glycol (1,2-Dihydroxyethane) and poly-ethylene glycol
(PEG) are not the same substances! PEG is a long-chain polymer of very high
molecular weight compared to a little ethylene glycol molecule. Their
associated toxicities are radically different!
Trust me, I am a chemist.
73, Paul WN7T
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